Combined punch and shear



Sept. 30 1924.

L. N. LUMB COMBINED PUNCH AND SHEAR Filed July 2, 2 Sheets-Sheet.

- INVENTOR ATTORNEY .IIIL

Sept. 30 1924.

L. N. LUMB COMBINED PUNCH AND SHEAR Filed July 2, 1925 2 Sheets-Sheet,

' INVENTOR lllll L On C A,

ooooooooooooon A TTORNE Y ldatented iiept. fill,

UNITED STATES PAT ENT OFFICE.

LOUIS NORMAN LUMB, OF ASTORIA, NEW YORK, ASSIGNOR TO IRVING IRON WORKS COMPANY, A CORPORATION 013 NEW YORK.

COMBINED PUNCH AND SHEAR.

Application filed July 2,

To all whom it may concern.

Be it known that I, Loo-rs NORMAN LUMB,

a citizen of the United States of America,

residing at Astoria, Queens County, New York, have invented certain new and useful Improvements in a Combined Punch and Shear, of which the following is a specification.

The present invention relates to machinery 1 for the rapid and accurate fabrication of steel gratings for floors, steps and other sup porting surfaces, now generally known in the trade as ventilated steel floorings. These gratings generally consist of a plurality of parallel straight bars between, and to which are riveted bent or reticulated spacing strips, such, for instance, as are shown in Patent No. 1,045,795, granted November 26, 1912, to Gustav A. Keller. Both the straight bars and bent strips comprising such a grating have to be cut to length and have holes punched therethrough at accurately determined points preparatory to being assembled and riveted together to form the grating. The rapid and accurate cutting and punching of these strips or bars conduces greatly to economy of manufacture and standardization of the product. The best form of apparatus embodying the present invention for this purpose, at present known to me, is illustrated in the accompanying two sheets of drawings, inwhich,

Fig. 1 is a front elevation of the reciprocating head and cooperating bed of the machine, parts being broken away;

Fig. 2 is a cross-section taken in a vertical plane on line 2--2 of Fig. 1;

Fig. 3 is a detail similar cross-section on line 3-3 of Fig. 1;

Fig. & is a plan view and partial section on line 4. 4 of Fig. 1;

Fig. 5 is a cross-section on a vertical plane alongline 55 of Fig. 41, parts being broken away;

Fig. 6 is a detail longitudinal section on line 66 of Fig. 4; and

Figs. 7 and 8 are perspective views of two different types of bars cut and punched on the machines, parts beingbroken away.

Throughout the drawings like reference characters indicate like parts. 1 is the reciprocating head, and 2 the bedplate of the 1923 Serial No. 648,861.

machine, the guides, main frame and power connections not being shown. 3 is the upper and 4- the lower knife, carried respectively by the head and bed plate and constituting the shears. These knives are held in place by bolts 5, 5, passing through slots int-heir bases, and 6, 6, are bolts or set screws for adjusting the knives horizontally so that they will properly co-operate one with the other.

7, 7, are punches held by cup shaped couplings 8, 8, to supporting studs 9, 9, carried by head 1, andlO, 10, are co-operating dies supported in bed plate 2. These punches and dies are spaced apart the distance between holes 34, 3 1, in the completed bars such as 14 and 14*, shown in Figs. 7 and 8. While agreater or less number of punches and dies could be used, two sets are shOWn for purposes of illustration. 11 is a stripper plate for the punches, and so stripping it from the punches during their upstroke. Said plate 11 is held by bolts 13, 13, in position on a liner 12, which latter also serves as a side guide for the strip 1 1, being punched. The holes in guide plate 11 may be countersunk as best shown in Fig. 2, to serve as reservoirs for oil for the punches.

it is evident that while all the bent strips forming a given panel of grating require holes punched at practically identical points, the straight bars of each panel will be of two types or classes, one of which, 145*, shown in Fig. 7, will have the first hole, 34, near its end, while the other, 14*, shown in Fig. 8, will have its first hole, 34:, farther back from the end of the bar. To enable these two latter types of bars to be rapidly punched without shifting the gauge stops, two of these stops are employed. The first stop, 19, for use in punching bars of type 141 is supported on pivot 20 on base block 21, and normally held in raised position by spring 22, out of the path of strip 14, be-

ing punched, as shown in Figs. 1 and 3.

The base block 21 is adjustably supported on bed plate 23, which is an extension or continuation of thepunch bed 2. This bed plate has holes 24 formed in it in pairs, each pair being spaced apart a quarter of an inch or at some other convenient distance, and tapped to receive flat headed screw pins 25, 25, carried by base block 21. When thus adjusted on bed plate 23, base block 21 is firmly held in such position by bolt and nut 26 passing through a hole in the base'block and through slot 2'? in the bed plate 23. A second gauge stop 19 is similarly mounted on base block 21 at a distance from the first stop 19 equal to half the distance between centers of adjacent holes 34., 34:, in the punched bars, the distance between said holes, and between punches 7, 7, being usually seven inches. This second gauge stop 19 is used when punching the first hole 34., in. bars like 149, shown in Fig. 8.

To secure accurate spacing of holes 34: throughout the entire length of a bar formed from strip 14, the gauge pin 28 is mounted in guide block 29 supported on bed plate extension 2 and normally held up in position shown in Figs. 3 and 6 by a flat spring 30, fastened to bed plate extension 2 by screw 31 and seated in a recess 35, on the under side of said bed plate. This guide a block 29 has a certain amount of endwise adjustment and isheld in adjusted position by capstan bolt 32, which, in turn, may be locked. in position by a locking screw 33.

A combination stop for the strip 1 i being punched and gauge by which said strip may becut off to form a bar when a sufficient length has been punched, shown at 15, is mounted on a guide 16 rigidly fastened to, and forming a further extension of, bed plate 2, 2 As shown this stop and gauge 15 is held to guide 16 by clamps 17, 17, and bolts 18, 18 (see Figs. 1, t and 5).

The mode of operation of the above described apparatus is as follows: 7

If bars of the type l f are to be cut and punched, a long strip 14; of steel of the proper width and thickness is slidrin under stripper plate 11, along liner guide 12, until the forward end of such strip strikes gauge 19, which is depressed into its pathby the operator. The motive power is then thrown into operation and head 1 descends, causing punches 7, 7, to punch the first two holes 3. L, 3a, to form a barla properly spaced from the forward end thereof. Stop gauge 19 is then allowed to rise and strip 14 is fed forward by the operator, pressing down pin 28 until the second hole 3% in such strip comes over the pin whereupon the pin rises and enters said hole 34 and locks the strip 14 in position for the accurate punching of the next two holes, the head 1 carrying punches 7, 7,. making one complete reciprocation at each punching operation. As

. pin 28 is located seven inches from the right hand unch 7 measurin between centers the third hole 34; thus punched willbe seveninches from the second, and repetition of the last described operation will punch a series of holes in the strip, all spaced seven inches apart. hen the forward end of strip 14: strikes combined stop and gauge 15, the operator knows that he has punched a sufficient length of the strip 14 to produce a bar 14 of the required length, and thereupon he takes the strip out from under guide plate 11, shifts it to a position over lower knife at, holding its forward end against 15, which now serves as a gauge for the shears, and the next reciprocation of head 1 cuts off from the strip 14 a bar 14 or the required length. The strip 14 is then replaced under stripper late 11, and the operation repeated to orm another similar bar.

To form bars of type 14 the operation is the same as above described except that gauge stop 19 is used when punching the lirst two holes.

It will be evident to anyone skilled in the art that various details of the above described apparatus can be modified and certain of the features omitted without departing from the substance of the invention so long as the general principle of operation above set forth is retained wholly, or in essential parts thereof.

Having described my invention, I claim:

1. In a. machine for punching holes in metal strips at predetermined points and cutting said strips to predetermined lengths, the combination, with the main frame, and a die supported thereby, guides for the metal strip to be punched, a reciprocating head and a punch carried thereby, and cooperating knives carried by said frame and head forming a pair of shears, of an adjustable stop and gauge rigidly connected to the main frame in line with the guides for the strip being punched and in position to act as a stop for said strip when a predetermined number of holes have been punched therein and also as a gauge for same when placed in the shears to sever said punched portions from the remainder of the strip.

2. In a machine for punching holes in metal strips at predetermined points the combination, with the main frame and a die supported thereby and a reciprocating head and a punch carried thereby, of a plurality of stops adapted to cooperate with the for vard end of the advancing strip, said stops being located at different distances from the punch and normally held out of the path of the strip, but capable of being moved into said path, whereby through bringing one or another of said strips into operative position the strip may be arrested at points such that holes may be punched in the strip at correspondingly different distances from the end thereof.

3. An apparatus such as described in.v claim 2 combined with an additional stop for the strip located at a greater distance from the punch whereby the number of holes punched in the strip may be limited.

4. An apparatus such as described in claim 2 combined with an additional stop 5 for the strip located at a greater distance from the punch whereby the number of holes punched in the st-ri may be limited and a pair of shearing knives, carried by the head and frame, located adjacent to the punch and at a distance from said additional stop 10 corresponding to the desired length of the strip to be punched and cut.

LOUIS NORMAN LUMB. Witnesses:

T. H. SNEDIKE, JR. WM. J. BROWN. 

